Arrays

Question 1

What is an array used for?

Answer 1

A collection of variables of the same type organized in a way that can be easily manipulated.

Question 2

Are arrays objects?

Answer 2

Yes

Question 3

Array syntax

Answer 3

type arrayname[ ] = new type[size];

Question 4

Base type

Answer 4

The element type of the array

Question 5

Index

Answer 5

The location of an individual element in the array

Question 6

Initializing an array

Answer 6

type arrayname[ ] = {val1, val2};

You can just initialize an array rather than using the new declaration.

Question 7

What happens when you overrun the end of an array?

Answer 7

A run-time error

Question 8

Multi dimensional array syntax

Answer 8

type arrayname [] [] = new type[size] [size];

Each dimension is placed in its own set of brackets.

Memory is specified for only the first (leftmost) dimension.

Question 9

Array initialization for a 2D array

Answer 9

type arrayname[] [] = {
{Val, Val}
{Val, Val}
};

Question 10

Alternative Array Declaration

Answer 10

type[] arrayname;

convenient when declaring multiple arrays on the same line.

Question 11

arrayname1 = arrayname2;

Will the array contents be copied?

Answer 11

No, it will refer to the original array.

Question 12

Array Length

How can it be used in iteration?

Answer 12

arrayname.length

It represents the number of elements an array can hold, not its actual contents.

Can be used to govern the number of iterations that take place.